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block: allow resizing of images residing on host devices

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Allow to resize images that reside on host devices up to the available
space.  This allows to grow images after resizing the device manually or
vice versa.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Christoph Hellwig 2011-09-21 01:10:37 +02:00 committed by Kevin Wolf
parent ebffe2afce
commit 55b949c847
1 changed files with 21 additions and 3 deletions
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24
block/raw-posix.c
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@ -649,10 +649,24 @@ static void raw_close(BlockDriverState *bs)
static int raw_truncate(BlockDriverState *bs, int64_t offset)
{
BDRVRawState *s = bs->opaque;
if (s->type != FTYPE_FILE)
return -ENOTSUP;
if (ftruncate(s->fd, offset) < 0)
struct stat st;
if (fstat(s->fd, &st)) {
return -errno;
}
if (S_ISREG(st.st_mode)) {
if (ftruncate(s->fd, offset) < 0) {
return -errno;
}
} else if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
if (offset > raw_getlength(bs)) {
return -EINVAL;
}
} else {
return -ENOTSUP;
}
return 0;
}
@ -1178,6 +1192,7 @@ static BlockDriver bdrv_host_device = {
.bdrv_read = raw_read,
.bdrv_write = raw_write,
.bdrv_truncate = raw_truncate,
.bdrv_getlength = raw_getlength,
.bdrv_get_allocated_file_size
= raw_get_allocated_file_size,
@ -1299,6 +1314,7 @@ static BlockDriver bdrv_host_floppy = {
.bdrv_read = raw_read,
.bdrv_write = raw_write,
.bdrv_truncate = raw_truncate,
.bdrv_getlength = raw_getlength,
.bdrv_get_allocated_file_size
= raw_get_allocated_file_size,
@ -1400,6 +1416,7 @@ static BlockDriver bdrv_host_cdrom = {
.bdrv_read = raw_read,
.bdrv_write = raw_write,
.bdrv_truncate = raw_truncate,
.bdrv_getlength = raw_getlength,
.bdrv_get_allocated_file_size
= raw_get_allocated_file_size,
@ -1521,6 +1538,7 @@ static BlockDriver bdrv_host_cdrom = {
.bdrv_read = raw_read,
.bdrv_write = raw_write,
.bdrv_truncate = raw_truncate,
.bdrv_getlength = raw_getlength,
.bdrv_get_allocated_file_size
= raw_get_allocated_file_size,